Binary Search: Not Just for Sorted Arrays

Mon, 06 Jul 2026 10:00:00 +0500

Ask most candidates what binary search is for, and you’ll get the same answer: “finding an element in a sorted array.” That answer is technically correct and strategically wrong — and it’s why binary search interview problems have such a brutal failure rate.

Here’s the reframe that changes everything: binary search is a technique for shrinking a search space in half whenever you can answer one yes/no question about the middle. The sorted array is just the most famous search space. Once you see it this way, problems like “minimum eating speed” and “split an array to minimize the largest sum” stop looking like exotic puzzles and start looking like the same 15 lines of code.

Binary-Search on Algorithms in 60 Days

Binary Search: Not Just for Sorted Arrays